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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae5bd0de193119802abda06208622de2990c22af7a927d8b44aada970675ef8' 
  AND token = '/4Y5g0mm6efuTha6UXbKLEOSL7iNFSaOaSJrdhMNzqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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