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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062a385207e4023c780704dce048e5d4e87d5956ff919d84029b9f2b3d2e2433' 
  AND token = 'F8hlfHmM4ra1vLAn1NfCsB7idrCWJFQZWHsklJ4sgg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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