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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b986d6544b304841df811e5f42d279c39ad3c1af9cf953d178b80ba0ac120989' 
  AND token = 'TAEs0h10/LHUlMyEXcq780iZ6SABbSsL1afOEzPbkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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