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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a64b32369ad7f7743f449678768b6493d9c959c4339fbd7fd743a2717935684' 
  AND token = 'XJmV8mz2Clx/lvvUzU2ZnoItgH6aMNxxX4fi5/+m3MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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