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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbd5ca99892bdaafefdfe4b311256b362e4445174b5ecf139a0d218f978b1d7' 
  AND token = 'p4Su+iU4uM6AkTpCtGKOxeTvadqNncCnYeLK2JXdP38=' 
  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"
    }
  }
}