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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53162c010460c968d9e447ce8feb410ec61646ad88b99f30bbb4621f129a7d06' 
  AND token = 'TSUs/6AByzcKuh7vv0Ls2eIEbQw9/RUQZmwDNGwtAPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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