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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a73d2d4b99b5682b2a8010b3b9c4d3f3e58d3b37ed8c517fd337f1a26d6ce2' 
  AND token = '/XYaWnVLrZHPabFn3YzOX79dW3So9R/tUnOQcozqoe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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