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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219a6a04ee4cd064fa06c915f4a5a5a8dff039fd69faf19cc16b99c72eb7787f' 
  AND token = 'P8Y/MJGQcx6+pnb0QG9MSxC2dq4yBNbeXa+VKNuwyUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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