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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270c7cda9b6499853fc6d66db4bc60182ee14c179210861618955d9e6594e2f6' 
  AND token = '2U49DFS2wJW0k8wCgTXpEYj7jqUJ/HLIxjLsHacLpiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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