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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c3298adab32c069f976563193170cf3811c4e9226919a6ff9ded478ad8e50d' 
  AND token = 'o/uudiR8aXND7ZQMOXQekJYMvG9UkhGvP65Qyp/YowY=' 
  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"
    }
  }
}