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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af98b9f7349e60be41c1c856dc4ecd7d5c6a4e34533cf60bce4518ab1509aba6' 
  AND token = '8TMgN5ahpVMnxSzGcQA5S0CQTAWKThItmXU0Yc5ksrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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