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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db488a1d31fe0e7b4aa190e0d6d3394e24a10fa78347215eb400d2935a8e001' 
  AND token = 'XnhYYdSgUeCgJ2h4HKpDU9TnmQ2rMnPL9v6+5Zvp+j8=' 
  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"
    }
  }
}