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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbbf15aef14dd845054f641b795c5a5dca8f6e442e699c9bb43d492f7bc8f79' 
  AND token = 'zWsb9Q/iSTQQhgJM33kKrnbvNor689QE1OgAMSWgdOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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