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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf15effef9d419f2383bfd121246f7ed0d683cc7b382b8e1ece835f66fe3610' 
  AND token = 'ti6zc2RCvX3VpJz9RQ+CSRr1EqqtWQE1P+N6uzE3SX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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