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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cec5f51cfe21b1ea7cc2263b00e80183f9a0c559814b431b1227ef0cbac7d24' 
  AND token = 'yaF0V4YdrT0D2YLfetWOOCeFiAyUPFn2zDC+JWWnPLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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