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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6e4760fcd4f7383b39b804852ba304ff48c0e8dd555b42dc435c8825bde8a6' 
  AND token = '0tBbMDAFfae8N+nKFpYKsJSiW1MMjtQ+kR+7vp0wPj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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