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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434ec4ec1bf5161c66ab148ef1526c755d1fd899d497981c9612fda3830421f2' 
  AND token = 'T+qQsiw61whqqoo1V0uPzwNJkgt3zatDdBs8LOqorGc=' 
  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"
    }
  }
}