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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceab8be56c761277adc7485c5a15e9195ca2c1ef6a85f5920a3dd2fd79ada12' 
  AND token = 'Lgj3funsGrT5zzc/b/5ssoOB7EhcMZqxZKsDaad1yCw=' 
  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"
    }
  }
}