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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f9db99db84c62cb7069938926baf36d0cf0f9384114917c81d530599f0f39e' 
  AND token = '+I6BiGAlvp5tvCkrJ/v52rL/PDxfcVvuZxxeRM8Dn1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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