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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d1f304f2e31b40eda946c796fb74fedfbd55fe49a40d4898836aabf129ae5' 
  AND token = 'SmkVF2Io8lqCQ6k9W+DC0Wgiknj6AejlHmh5Io39/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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