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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f0843730fc9f0231457d938b9c88f068d2ea629f40b3a65eecfa66d076de9f' 
  AND token = 'hE20QDZky2Eo5d7YV2ByR//TaHyWiZ8gT78Gw5WnVuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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