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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2929db6266da8b5d4a684d84f219eadb73cf6f1beb03a2790667efa1d964b4a3' 
  AND token = 'Cwkd+4HXPpQTuRsK9d6SBnq9c/bl5L6mQL5Jf4N8nms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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