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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84f0040cd52cde14829daa469c9a753715e9e1cc6d89662d2af5af3e5f206f8' 
  AND token = '/J8USMjSViIm2OOtZNg7KHLNLzjf4pKVlDdOg7SWxYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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