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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f367d50c3209da288423e97fd589c291ac4730a8a39310b603ba059c6f7d238c' 
  AND token = 'l9OAcjs7KK8H3na8qxAsvm9EblRHxpKkBrKM/7TK8k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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