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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9ab49ba923aa37cc8df37bd1d17b3d78ac8a141625f732b12120bb32fe0477' 
  AND token = 'QjD/HSD6EG89dPRyf97+f3aoanJiOZ+/GQKLQGo8aKU=' 
  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"
    }
  }
}