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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926d6fa1e9ea98fc51cc28d9bd818251c81cde6ede23f4bfd4a49ce65947722e' 
  AND token = '45U36ogvNXGdWi7NFWBxm1yQN7hJ/LtbCw0QSNkGcFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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