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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3412ec87d92b3ee740a2fcff9f935746f2eefd4d6bfe694cb122b3e6451ac7' 
  AND token = 'YNfO5gGf6eZdCq2UROgsUlTC18CuQ65t64Szz9GwdHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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