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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2cc4e19124475e8510bcf104d2854dc7c5bb127818de6bba685ac3899cec58' 
  AND token = 'fm2m5Vi1voLPwqZG7iklM8v3MU0tbNVDUDzOzLqASaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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