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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45927ba3c9708bbd929ddf0bdca24d81b04b3317f9a3358c5f1cc42eb781cd03' 
  AND token = 'MbGcG8DsEh8Ml2GwtNkllmRMj8tFvb7xItnJc3W0774=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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