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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e61cdcd545d5e8cf9d303c1292ad794c6e78343822e75f067e8cf0c65563f41' 
  AND token = '6juKEW//NqZA6WgWZWtm1WN7+I2QUaJ8xut/mg06yqI=' 
  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"
    }
  }
}