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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35993ea30cea8197acb4ef25f1e1a9300d524890b3c46b36cd987c619d223246' 
  AND token = 'H2RBt/l3mP0x30j5PY0EAylXbU8Lwv2k3TOvZu/MgJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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