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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bf30c913186308d2f3f40d0f8de56d3f6b3f77bb8593d9c72653dbf00b9e2e' 
  AND token = '1yeKo1VNFUy/33sIGP0AuX0Rv9dQVoAk90ptT5m6g1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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