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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bd1d8fbc53f7e0934e663f58b0ae1f721fdcb487c10fdd986af88a268024b1' 
  AND token = '2Ug7wcZk/3BzDPTDfy2+vmRmbH55O5svYsEjRNmCj04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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