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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbcdbb9d89f3dc4cf2484766455e39b6b35a9531c19c741e084b65192e444e4' 
  AND token = 'fiwTjDg4VkVQcvtEGgPDC87yWP7pzF5CoWGzMls34fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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