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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af5b0e47947fb7d95e7c2d8506aaabd4c290249dfe9fd623501060fa823fe90' 
  AND token = 'TF2i2tlhKc9Q/GnZUI9OIyZiH3FHka8vOwUBzWQu2Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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