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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaca25aecfa628c2af516d656d0a4b9f2c5d73d88c8d80de0dddf09a2a094c86' 
  AND token = '5KyrVRt3PiEFalZ2vAeytanV/nVbcgT41cDgAXRvAZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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