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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f050807f22952cfd968377c9b7921ecdb730866a95750af73fb0b34053f26' 
  AND token = '+5DUW9Li0OKGPO00PU5mDl0/adbA2n73NIsJZqAMjfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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