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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf933910accf4b0226f689cec2afe6e6694cdb79f4d21fc8e15f268424a00f9' 
  AND token = 'l1GALg6XJR8LQhihvET1zTQyRiexRD+FILH+pR6bxRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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