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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3708ce410eeef1b90624667c1dc8b33011690d0c41c1a4d29f23af9d9db1dc7' 
  AND token = 'NMuhS+8RGzxeqi3fBDHyspBsa5iw8DuJ7nB/ou24Mpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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