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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f1a38505d907c3a056c1fa5ff5cca8c0d7519387339ba379f0890c20c0758c' 
  AND token = 'sGP/NGH/8VlRMpdDxt+IDgAAwZ7dc1xUmgMOXpwS6fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}