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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88fbb23f96d0a388bff3440d1f17ba6a189e439e54a0cf9e988b1fbb17e7045' 
  AND token = '8nSfgcDk5Xw0Z09Ba657osWufcSSIHogEER2xfVr0/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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