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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc48bf3a00d9042ea7d7f78314177794b2970fee73de49d48c9f243e4d5eb61' 
  AND token = 'Wu7qIUGoZ5PnOF9k0pyjEueek1LSU3Bu5aW7wwlJCdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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