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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad46813f64df8e2bc1b90c3786fa3f274738ae6c4ec0aee4c16bcb32384892' 
  AND token = '3gxitJCs/rzNOZsG7jmBMzLOsp374dEF0arGNaWAS3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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