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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60001d75b633fe2bf17db36b614667ec75f95abc476e537f3c1252ff8b64c346' 
  AND token = 'bN2HzH2ZaizWg9ops32yjQSs5UmTHPM8YA349d3MqlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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