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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b5749494f89adf3f2e982f01aa4ac1b4024fbe1ec5d985d8a92cde6ea1a43d' 
  AND token = 'AQEiYmF0uWXNdycZB7EbxzhopeiI57Tidp3x8vkj2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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