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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9e30e50d8d6764208cd5bea6e34e26ea98d5366a2db0f922b1694960e73c88' 
  AND token = 'd+Ohl8VdMVGECk3q48plkfqkLE3nXbyk7eQrnyWao/0=' 
  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"
    }
  }
}