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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa994fb9aa8c12f8744ff8c203d4f9937e8b9b6c7607638f14a72bc1277ea29' 
  AND token = 'd7ZLci78LOVkX5pcOAD/0yZwnvJFpHCRsHz4JNaKTNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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