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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcc24941f4dc3f145b276246ef47719a10f7b970aaaea1857bb3b7461e0c3c4' 
  AND token = 'm6m2qXdkf3yqD8bZ3n7/2ki4SKlmECJQ7HmCDWZVDhA=' 
  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"
    }
  }
}