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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429d8076a3240de8bf93a70b8c113dc9080a56e804b52731ba5afe5654496525' 
  AND token = 'T+vPPJcKapNdGiMvsdjWJS7vADnzS9qIcW3YOulebzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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