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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef6e45e5f57dad25b33279102db1195709fed4af148663677b00a8457a47cae' 
  AND token = 'rga5CIXII+qB5cHFCqKZc28aWQdiwcGaEg9MPY/fOFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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