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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d14b17bfb62598e2c894be2e7ac9b3e117edf1d1ceba419fb20927c07b4fb6c' 
  AND token = 'T4bIE15dgLTzAtnPZ6CSBFZWxL/Om08pJrCpmkt/hjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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