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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a4b6ed4f2a9c8ab84dbdbc7cd45153da2467a05759e54162de7cfcd8dbef28' 
  AND token = 'DHZHeApMWDz5ltvOWjp1IDaY7QgOoap5b1Se/2rmuws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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