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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7e45e6e2d749207a6bff610cd5b5272cdfacbc6683630a5311c7eed2233397' 
  AND token = 'DSBC/K+Omnv4YxF+UNvdX83dpSNXwyxdE/JTw8VnbfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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