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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e537ec9813f1586433cfa8ec837eb2312b230a02e88790d5a4e9cca7b1c2e127' 
  AND token = 'TQkgK606Z8K/1kKtZqw+X7QWX21HkAZ8RhwRUD9tRyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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