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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba66a06e679195e80e725b2a20fc73e647848c646c53822e3e52d74d86fc52a' 
  AND token = 'KXeVFLmeo5stodIMczjWh34CK0iPsJCCUz5njiW09gE=' 
  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"
    }
  }
}