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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7ef9549cb5e9faec0ec80fc84db70db8c1031426a039247008bbc2f6ceec1b' 
  AND token = 'GEN/ypy97F1mJimZHv5QAd5g6+utHqPRi8kk+Xtf41U=' 
  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"
    }
  }
}