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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc5a9683761bc19b8a1107c8eb324ef4bb3e2a4e817c44c07c1da1275edcf1f' 
  AND token = 'neW8qqWoYDO35bGC1tOm50tWU/WuqDNUNoKuXQU+vL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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