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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6420df81f5c671113ab228560f4ef70fc1f8ecf8e573b9f4786e217fea607640' 
  AND token = 'lcP79ki5iCKnh/0eMJX5B5m9avS4f5m8AQHGvyuo8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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