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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bb5ea381438387c7a9dec35739a20053ab8289d9c61b7503d51f3e28491254' 
  AND token = '00OgF9G2OrLXPIS2KEaDi5zND6VVmO8+5ELyUM14PCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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