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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9de73444512b4a97fe51203672c3b2d7b3714179749be76a6ac03efaa21a55' 
  AND token = '/xr5zMATf7YqX63loLyaN4RAtyhib5KAa+0RMQ7Kxnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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