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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4042aa3b64ce2034e6a95a70457f1d1649108424a0d9b213e51fe4a712a583e6' 
  AND token = 'dcfASjCvv6TE3f0oW6ZFUPWszj7XW2gnNsq3SQMD32c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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